1 files changed, 1 insertions, 1 deletions
diff --git a/UVtools.Core/Operations/OperationThreshold.cs b/UVtools.Core/Operations/OperationThreshold.cs
index d516b8e..4754f00 100644
--- a/UVtools.Core/Operations/OperationThreshold.cs
+++ b/UVtools.Core/Operations/OperationThreshold.cs
@@ -101,7 +101,7 @@ namespace UVtools.Core.Operations
             using var original = mat.Clone();
             var target = GetRoiOrDefault(mat);
             CvInvoke.Threshold(target, target, Threshold, Maximum, Type);
-            ApplyMask(original, mat);
+            ApplyMask(original, target);
             return true;
         }